Back in the video-game heyday of the ‘90s, it wasn’t uncommon to see high-profile titles get releases on portable systems as well as home consoles. The former ports were invariably watered down — handhelds could at best make a valiant attempt at capturing the spirit of whatever the game was, but the chunky hardware just couldn’t quite get there. Surprisingly, the iOS conversion of well-regarded shoot-'em-up Sine Mora feels like a throwback to those days.